Quick Verdict · REV-2026-050
Forest Leaf is a functional mid-tier option with good Amazon reviews and a complete 5-organ formula. The opaque sourcing story prevents it from ranking higher.
For buyers between Force Factor's price and Left Coast Performance's NZ provenance, it fills the gap — but for an extra $0.08/serving, Left Coast Performance's confirmed NZ sourcing is the better choice.
formula
7.5 / 10
5-organ blend: liver, heart, kidney, spleen, pancreas.
transparency
6.0 / 10
Sourcing country not disclosed on the main label.
verification
5.5 / 10
No third-party certification.
value
9.0 / 10
At ~$28/bottle ($0.
practical
8.0 / 10
6 capsules per serving.
Forest Leaf in the Organ Supplement Landscape
Forest Leaf Beef Organ Complex occupies the mid-range of the organ supplement category: more expensive than Force Factor's undisclosed-sourcing budget option ($0.18), cheaper than the NZ-sourced brands ($0.39–$0.50), and without the organic certification of Perfect Supplements ($0.33). The formula is complete and the Amazon review history is positive.
The value of Forest Leaf is primarily price and convenience. If you want a 5-organ blend on Amazon Prime without paying for NZ sourcing, this is a reasonable option. The sourcing opacity is the main limitation — it is difficult to justify Forest Leaf over Left Coast Performance for $0.08 more per serving when Left Coast provides confirmed NZ provenance.
The $0.08 question
Left Coast Performance costs $0.39/serving vs Forest Leaf's $0.31. For a 30-serving bottle, that's $2.40 more per month — for confirmed NZ sourcing. For most buyers, that premium is worth it.
FSP Score Breakdown
FSP v2.1 composite: 6.64/10 → editorial score: 7/10. Weighting: Formula 35% · Transparency 25% · Verification 20% · Value 12% · Practical 8%.
Red & Green Flags
Supplement Facts
Key Nutrients from the 5-Organ Blend
Estimated contributions per 6-capsule serving based on USDA FDC data. Exact values unverifiable without sourcing disclosure.
Sourcing & Processing
Sourcing: what we know
Forest Leaf does not consistently disclose the country of origin for their beef organs. Some product listings and marketing materials have referenced US or NZ sourcing, but this is not confirmed across all listings. This inconsistency is itself a transparency signal — brands with premium sourcing typically lead with it.
What sourcing opacity means practically
Without a disclosed source country, there is no way to assess the regulatory environment governing the cattle. This does not mean the product is unsafe — Forest Leaf has no documented quality incidents and maintains high Amazon review ratings. It means quality cannot be independently verified, and you are relying on the brand's internal standards.
Processing
The product is described as freeze-dried on product listings, which is the preferred processing method for preserving heat-sensitive nutrients. Standard shelf-stable capsule format. No preservatives or flow agents on the label.
Lab Data & Verification
No third-party testing results are published for Forest Leaf. The strong Amazon review record is positive but is not a substitute for documented testing.
Not Published
No public batch testing
Not Certified
Not suitable for drug-tested athletes
N/A
No certification
Positive
High ratings, no incident history
Marketing Claim Audit
How to Take It
Recommended dose
6 capsules per day. Split 3 with breakfast and 3 with another meal for best tolerance.
Starting out
Begin with 3 capsules for the first week. Some people experience mild digestive adjustment when introducing organ supplements. Build to 6 if tolerated.
Timing
Always with food. Fat-soluble vitamins A, D, and K2 require dietary fat for absorption. Any fat-containing meal is sufficient.
Vitamin A tracking
Track total daily retinol from all sources. The tolerable upper limit is 10,000 IU/day. Add your multivitamin, fortified foods, and other liver products.
vs. Competitors
Forest Leaf sits at a price point between Force Factor and Left Coast Performance. This comparison shows what each $0.08 increment buys you.
| Forest Leaf | Force Factor | Left Coast Perf. | Perfect Supps | |
|---|---|---|---|---|
| FSP Score | 7/10 ★ | 7/10 | 8/10 | 8/10 |
| Price / serving | $0.31 ★ | $0.18 | $0.39 | $0.33 |
| Source country | Undisclosed | Undisclosed | New Zealand | Brazil |
| Organs | 5-organ ★ | 4-organ | 5-organ | Liver only |
| Certification | None | None | None | USDA Organic |
| COA available | No | No | No | No |
Prices verified May 2026.
Products at a Glance
Forest Leaf and its price-tier alternatives — prices verified May 2026.
Pros & Cons
Strengths
- 5-organ comprehensive blend
- Competitive mid-tier price ($0.31/serving)
- Strong positive Amazon review history
- No fillers
Limitations
- Sourcing country not consistently disclosed
- No COA or third-party testing
- Less brand credibility than top-tier options
Safety & Vitamin A
Standard safety considerations for organ supplements apply to Forest Leaf as for all products in this category.
Vitamin A tracking
Liver in the blend contributes preformed retinol. The tolerable upper limit is 10,000 IU/day. Add your multivitamin and other retinol sources before assessing total intake.
Heavy metals
No COA is available for Forest Leaf. Without documented testing, heavy metal levels are unverifiable. For general healthy adults at normal doses, practical risk is low. For pregnant women or children, choose a product with published testing.
Pregnancy
Pregnant women should not use liver supplements without physician guidance. Preformed retinol at elevated doses is flagged in obstetric guidelines.
Price & Value
$0.31/serving is reasonable for a 5-organ blend with good Amazon reviews. The value score (9.0/10) reflects the price-to-formula ratio — good value for what is labeled. The sourcing gap means quality-adjusted value is lower than the raw price suggests.
Where to Buy
Amazon US
RecommendedPrimary channel. Prime eligible. Check the listing is sold by Forest Leaf or fulfilled by Amazon. Verify the label shows the current 5-organ formula.
~$28
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Final Verdict · REV-2026-050
Solid mid-tier. Left Coast beats it for $0.08 more.
Functional formula, reasonable price, strong Amazon reviews. The sourcing opacity is a frustrating gap that prevents a higher score.
For $0.08 more per serving, Left Coast Performance's confirmed NZ sourcing makes it the better choice at this price tier. If Forest Leaf had consistent sourcing disclosure, it would score 8/10. Until then, it earns 7.
FSP Editorial Score
Good formula. Opaque sourcing. Upgrade to Left Coast for $0.08 more.
Research References
- USDA FoodData Central. Beef organ nutrient profiles — liver (#174489), heart (#174470), kidney (#174481), spleen, pancreas. ↗
- Institute of Medicine. Dietary Reference Intakes for Vitamin A (2001). Tolerable Upper Intake Level: 10,000 IU/day for adults. ↗
- Fellows PJ (2009). Food Processing Technology. Freeze-drying process parameters and nutrient retention. ↗